Empty aerosol can with a rod driven through top to bottom suspended across the top of a 5 gallon bucket with a few inches of water in it and a ramp up to the can. Smear some peanut butter on the can.
1 of my outside dogs water buckets always has a mouse or mice in it.
One day he had like 8 dead one in it. Mom & dad and all the babies
Yep, the most effective traps I’ve seen were various forms of this design. All rely upon some type of ramp over a bucket of water, with the ramp designed so that it tips and drops the mouse into the water when it tries to get the bait at the center. They’ll just keep following each other to their doom, like lemmings, by the dozens with such a trap.